1
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Cao J, Zhang L, Zhou X. Constructing a prognostic tool for predicting the risk of non-adherence to antiplatelet therapy in discharged patients with coronary heart disease: a retrospective cohort study. PeerJ 2023; 11:e15876. [PMID: 37576506 PMCID: PMC10422952 DOI: 10.7717/peerj.15876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Accepted: 07/18/2023] [Indexed: 08/15/2023] Open
Abstract
Objective To investigate the incidence and influencing factors affecting the non-adherence behavior of patients with coronary heart disease (CHD) to antiplatelet therapy after discharge and to construct a personalized predictive tool. Methods In this retrospective cohort study, 289 patients with CHD who were admitted to the Department of Cardiology of The First Affiliated Hospital of the University of Science and Technology of China between June 2021 and September 2021 were enrolled. The clinical data of all patients were retrospectively collected from the hospital information system, and patients were followed up for 1 year after discharge to evaluate their adherence level to antiplatelet therapy, analyze their present situation and influencing factors for post-discharge adherence to antiplatelet therapy, and construct a nomogram model to predict the risk of non-adherence. Results Based on the adherence level to antiplatelet therapy within 1 year after discharge, the patients were divided into the adherence (n = 216) and non-adherence (n = 73) groups. Univariate analysis revealed statistically significant differences between the two groups in terms of variable distribution, including age, education level, medical payment method, number of combined risk factors, percutaneous coronary intervention, duration of antiplatelet medication, types of drugs taken at discharge, and CHD type (P < 0.05). Furthermore, multivariate logistic regression analysis revealed that, except for the medical payment method, all the seven abovementioned variables were independent risk factors for non-adherence to antiplatelet therapy (P < 0.05). The areas under the receiver operating characteristic curve before and after the internal validation of the predictive tool based on the seven independent risk factors and the nomogram were 0.899 (95% confidence interval [CI]: 0.858-0.941) and 0.89 (95% CI: 0.847-0.933), respectively; this indicates that the tool has good discrimination ability. The calibration curve and Hosmer-Lemeshow goodness of fit test revealed that the tool exhibited good calibration and prediction consistency (χ2 = 5.17, P = 0.739). Conclusion In this retrospective cohort study, we investigated the incidence and influencing factors affecting the non-adherence behavior of patients with CHD after discharge to antiplatelet therapy. For this, we constructed a personalized predictive tool based on seven independent risk factors affecting non-adherence behavior. The predictive tool exhibited good discrimination ability, calibration, and clinical applicability. Overall, our constructed tool is useful for predicting the risk of non-adherence behavior to antiplatelet therapy in discharged patients with CHD and can be used in personalized intervention strategies to improve patient outcomes.
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Affiliation(s)
- Jiaoyu Cao
- Department of Cardiology, The First Affiliated Hospital of the University of Science and Technology of China, Hefei, China
| | - Lixiang Zhang
- Department of Cardiology, The First Affiliated Hospital of the University of Science and Technology of China, Hefei, China
| | - Xiaojuan Zhou
- Department of Cardiology, The First Affiliated Hospital of the University of Science and Technology of China, Hefei, China
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2
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Sun B, Ma S, Xiao F, Luo J, Liu M, Liu W, Luo Z. Integrated analysis of clinical and genetic factors on the interindividual variation of warfarin anticoagulation efficacy in clinical practice. BMC Cardiovasc Disord 2023; 23:279. [PMID: 37254053 DOI: 10.1186/s12872-023-03321-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Accepted: 05/25/2023] [Indexed: 06/01/2023] Open
Abstract
AIM The anticoagulation effect of warfarin is usually evaluated by percentage of time in therapeutic range (PTTR), which is negatively correlated with the risk of warfarin adverse reactions. This study aimed to explore the effects of genetic and nongenetic factors on anticoagulation efficacy of warfarin during different therapeutic range. METHODS We conducted an observational retrospective study aiming at evaluating the impact of clinical and genetic factors on PTTR from initial to more than six months treatment. This analysis included patients with heart valve replace (HVR) surgery who underwent long-term or life-long time treatment with standard-dose warfarin for anticoagulation control in Second Xiangya Hospital. All patients were followed for at least 6 months. We genotyped single nucleotide polymorphisms in VKORC1 and CYP2C9 associated with altered warfarin dose requirements and tested their associations with PTTR. RESULTS A total of 629 patients with intact clinical data and available genotype data were enrolled in this study, and only 38.63% patients achieved good anticoagulation control (PTTR > 0.6). Clinical factors, including male gender, older age, overweight, AVR surgery and stroke history, were associated with higher PTTR. Patients with VKORC1 -1639AA genotype had significantly higher PTTR level compared with GA/GG genotype carriers only in the first month of treatment. Patients with CYP2C9*3 allele had higher PTTR compared with CYP2C9*1*1 carriers. Moreover, compared with VKORC1 -1639 AG/GG carriers, INR > 4 was more likely to be present in patients with AA genotype. The frequency of CYP2C9*1*3 in patients with INR > 4 was significantly higher than these without INR > 4. CONCLUSION We confirmed the relevant factors of warfarin anticoagulation control, including genetic factors (VKORC1 -1639G > A and CYP2C9*3 polymorphisms) and clinical factors (male gender, older age, overweight, AVR surgery and stroke history), which could be helpful to individualize warfarin dosage and improve warfarin anticoagulation control during different treatment period.
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Affiliation(s)
- Bao Sun
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, No.139, People's Middle Street, Furong District, Changsha City, 40013, Hunan Porv., China
- Institute of Clinical Pharmacy, Central South University, Changsha, China
| | - Siqing Ma
- Department of Pharmacy, Hunan Institute for Tuberculosis Control, Changsha, China
- Department of Pharmacy, Hunan Chest Hospital, Changsha, China
| | - Feiyan Xiao
- Center for Clinical Trial and Research, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Jianquan Luo
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, No.139, People's Middle Street, Furong District, Changsha City, 40013, Hunan Porv., China
- Institute of Clinical Pharmacy, Central South University, Changsha, China
| | - Mouze Liu
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, No.139, People's Middle Street, Furong District, Changsha City, 40013, Hunan Porv., China
- Institute of Clinical Pharmacy, Central South University, Changsha, China
| | - Wenhui Liu
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, No.139, People's Middle Street, Furong District, Changsha City, 40013, Hunan Porv., China
- Institute of Clinical Pharmacy, Central South University, Changsha, China
| | - Zhiying Luo
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, No.139, People's Middle Street, Furong District, Changsha City, 40013, Hunan Porv., China.
- Institute of Clinical Pharmacy, Central South University, Changsha, China.
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3
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Oliveira GMMD, Brant LCC, Polanczyk CA, Malta DC, Biolo A, Nascimento BR, Souza MDFMD, Lorenzo ARD, Fagundes AADP, Schaan BD, Castilho FMD, Cesena FHY, Soares GP, Xavier GF, Barreto JAS, Passaglia LG, Pinto MM, Machline-Carrion MJ, Bittencourt MS, Pontes OM, Villela PB, Teixeira RA, Sampaio RO, Gaziano TA, Perel P, Roth GA, Ribeiro ALP. Estatística Cardiovascular – Brasil 2021. Arq Bras Cardiol 2022; 118:115-373. [PMID: 35195219 PMCID: PMC8959063 DOI: 10.36660/abc.20211012] [Citation(s) in RCA: 57] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 11/10/2021] [Indexed: 02/07/2023] Open
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Rusdiana T, Mardhiani YD, Putriana NA, Gozali D, Nagano D, Araki T, Yamamoto K. The influence of Javanese turmeric ( Curcuma xanthorrhiza) on the pharmacokinetics of warfarin in rats with single and multiple-dose studies. PHARMACEUTICAL BIOLOGY 2021; 59:639-646. [PMID: 34062109 PMCID: PMC8172219 DOI: 10.1080/13880209.2021.1928716] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
CONTEXT Co-administration between warfarin (WF) and Curcuma xanthorrhiza Roxb. (Zingiberaceae) (CX) is found in Indonesian patients and need to be evaluated. OBJECTIVE This study assesses the effect of concomitant administration of CX extract on the pharmacokinetics of WF in rats. MATERIALS AND METHODS Wistar rats were divided into 4 groups (n = 6) and administered with 2% Pulvis Gummi Arabicum (PGA, control), fluconazole (FZ, 6 mg/kg), CX-1 (6 mg/kg) or CX-2 (18 mg/kg BW) for 7 days. For the single-dose study, at the 8th day, WF (1 mg/kg) was administered to all groups and blood samples were taken from 0.25 to 72 h. For the multiple-dose study, daily dose of WF was administered to all groups of rats and at the 7th to 9th day, the rats were treated with PGA, CX-1, CX-2 and FZ. Blood samples were withdrawn daily at 4 h after administration of WF from the 1st to 11th day. RESULTS The area under the curve (AUC) of R- and S-WF in the CX-2 group was a significantly higher value compared to the control (77.54 vs. 35.27 mg.h/L for R-WF and 316.26 vs. 40.16 mg.h/L for S-WF; p < 0.05; Kruskal-Wallis method). The CX-2 administration also caused the increasing in the concentration level of R-WF (16%) and S-WF (27%) from the 7th to 9th day of administration. DISCUSSION AND CONCLUSIONS The CX administration in a higher dose caused alteration on WF pharmacokinetics suggesting the need for clinical evaluation of the interaction between CX and WF.
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Affiliation(s)
- Taofik Rusdiana
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Universitas Padjadjaran, Sumedang, Indonesia
- CONTACT Taofik Rusdiana Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Universitas Padjadjaran, Jl. Raya Bandung-Sumedang km 21, Jatinangor, Sumedang, West Java45363, Indonesia
| | | | - Norisca A. Putriana
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Universitas Padjadjaran, Sumedang, Indonesia
| | - Dolih Gozali
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Universitas Padjadjaran, Sumedang, Indonesia
| | - Daisuke Nagano
- Department of Clinical Pharmacology and Therapeutics, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - Takuya Araki
- Department of Clinical Pharmacology and Therapeutics, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - Koujirou Yamamoto
- Department of Clinical Pharmacology and Therapeutics, Graduate School of Medicine, Gunma University, Maebashi, Japan
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5
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Hirata TDC, Dagli-Hernandez C, Genvigir FDV, Lauschke VM, Zhou Y, Hirata MH, Hirata RDC. Cardiovascular Pharmacogenomics: An Update on Clinical Studies of Antithrombotic Drugs in Brazilian Patients. Mol Diagn Ther 2021; 25:735-755. [PMID: 34357562 DOI: 10.1007/s40291-021-00549-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/12/2021] [Indexed: 10/20/2022]
Abstract
Anticoagulant and antiplatelet drugs effectively prevent thrombotic events in patients with cardiovascular diseases, ischemic stroke, peripheral vascular diseases, and other thromboembolic diseases. However, genetic and non-genetic factors affect the response to antithrombotic therapy and can increase the risk of adverse events. This narrative review discusses pharmacogenomic studies on antithrombotic drugs commonly prescribed in Brazil. Multiple Brazilian studies assessed the impact of pharmacokinetic (PK) and pharmacodynamic (PD) gene variants on warfarin response. The reduced function alleles CYP2C9*2 and CYP2C9*3, and VKORC1 rs9923231 (c.-1639G>A) are associated with increased sensitivity to warfarin and a low dose requirement to prevent bleeding episodes, whereas CYP4F2 rs2108622 (p.Val433Met) carriers have higher dose requirements (warfarin resistance). These deleterious variants and non-genetic factors (age, gender, body weight, co-administered drugs, food interactions, and others) account for up to 63% of the warfarin dose variability. Few pharmacogenomics studies have explored antiplatelet drugs in Brazilian cohorts, finding associations between CYP2C19*2, PON1 rs662 and ABCC3 rs757421 genotypes and platelet responsiveness or clopidogrel PK in subjects with coronary artery disease (CAD) or acute coronary syndrome (ACS), whereas ITGB3 contributes to aspirin PK but not platelet responsiveness in diabetic patients. Brazilian guidelines on anticoagulants and antiplatelets recommend the use of a platelet aggregation test or genotyping only in selected cases of ACS subjects without ST-segment elevation taking clopidogrel, and also suggest CYP2C9 and VKORC1 genotyping before starting warfarin therapy to assess the risk of bleeding episodes or warfarin resistance.
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Affiliation(s)
- Thiago Dominguez Crespo Hirata
- Department of Clinical and Toxicological Analyses, School of Pharmaceutical Sciences, University of Sao Paulo, Av. Prof. Lineu Prestes 580, Sao Paulo, 05508-000, Brazil
| | - Carolina Dagli-Hernandez
- Department of Clinical and Toxicological Analyses, School of Pharmaceutical Sciences, University of Sao Paulo, Av. Prof. Lineu Prestes 580, Sao Paulo, 05508-000, Brazil
| | - Fabiana Dalla Vecchia Genvigir
- Department of Clinical and Toxicological Analyses, School of Pharmaceutical Sciences, University of Sao Paulo, Av. Prof. Lineu Prestes 580, Sao Paulo, 05508-000, Brazil
| | - Volker Martin Lauschke
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 77, Solna, Sweden.,Dr Margarete Fischer-Bosch Institute of Clinical Pharmacology, Stuttgart, 70376, Germany
| | - Yitian Zhou
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 77, Solna, Sweden
| | - Mario Hiroyuki Hirata
- Department of Clinical and Toxicological Analyses, School of Pharmaceutical Sciences, University of Sao Paulo, Av. Prof. Lineu Prestes 580, Sao Paulo, 05508-000, Brazil
| | - Rosario Dominguez Crespo Hirata
- Department of Clinical and Toxicological Analyses, School of Pharmaceutical Sciences, University of Sao Paulo, Av. Prof. Lineu Prestes 580, Sao Paulo, 05508-000, Brazil.
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Wang N, Qiu S, Yang Y, Zhang C, Gu ZC, Qian Y. Physician-Pharmacist Collaborative Clinic Model to Improve Anticoagulation Quality in Atrial Fibrillation Patients Receiving Warfarin: An Analysis of Time in Therapeutic Range and a Nomogram Development. Front Pharmacol 2021; 12:673302. [PMID: 34177585 PMCID: PMC8220138 DOI: 10.3389/fphar.2021.673302] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Accepted: 05/28/2021] [Indexed: 12/23/2022] Open
Abstract
Background: Poor time in therapeutic range (TTR) control is associated with an increased risk of stroke and bleeding in atrial fibrillation (AF) patients receiving warfarin. This study aimed to determine whether the physician–pharmacist collaborative clinic (PPCC) model could improve the anticoagulation quality as well as to create a nomogram for predicting anticoagulation quality in AF patients. Methods: This retrospective observational study enrolled AF patients who either initially received warfarin or returned to warfarin after withdrawal between January 1, 2016 and January 1, 2021, at our institution. The primary outcome was dynamic changes in TTRs (a TTR of ≥60% considered high anticoagulation quality). The secondary outcomes were thromboembolic and bleeding events during follow-up. We compared the dynamic changes in TTRs between the general clinic (GC) and PPCC groups in both the original and propensity score matching (PSM) cohorts. In addition, we explored the potential predictors of high anticoagulation quality and subsequently formulated a nomogram to predict anticoagulation quality. Results: A total of 265 patients with AF were included, comprising 57 patients in the PPCC group and 208 patients in the GC group. During a median follow-up period of 203 days, the PPCC group had a shorter time (76 vs. 199 days, p < 0.001) and more patients achieved a TTR ≥60% (73.7 vs. 47.1%, p = 0.002 by log-rank test) than the GC group. The results from the PSM cohort confirmed this finding. No significant differences in the incidences of thromboembolic events (5.3 vs. 5.3%, p = 1.000) and bleeding events (4.3 vs. 3.5%, p = 1.000) were observed between the two groups. Four variables were explored as predictors related to high anticoagulation quality: treatment within a PPCC, history of bleeding, history of bleeding, and the presence of more than four comorbidities. The nomogram revealed a moderate predictive ability (c-index: 0.718, 95% confidence interval (95%CI): 0.669–0.767) and a moderately fitted calibration curve. Conclusion: The PPCC model contributed to improved anticoagulation quality in AF patients receiving warfarin. The nomogram might be an effective tool to predict anticoagulation quality and could aid physicians and pharmacists in the selection of patients who will likely benefit from sustained and active intervention.
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Affiliation(s)
- Na Wang
- Department of Pharmacy, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Sha Qiu
- Department of Pharmacy, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Ya Yang
- Department of Infection Control, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Chi Zhang
- Department of Pharmacy, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China.,Shanghai Anticoagulation Pharmacist Alliance, Shanghai Pharmaceutical Association, Shanghai, China
| | - Zhi-Chun Gu
- Department of Pharmacy, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China.,Shanghai Anticoagulation Pharmacist Alliance, Shanghai Pharmaceutical Association, Shanghai, China.,Chinese Society of Cardiothoracic and Vascular Anesthesiology, Beijing, China
| | - Yan Qian
- Department of Pharmacy, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
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7
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Costa Viana C, da Silva Praxedes MF, Freitas Nunes de Sousa WJ, Bartolazzi F, Sousa Vianna M, Padilha da Silva JL, Parreiras Martins MA. Sex-influence on the time in therapeutic range (TTR) during oral anticoagulation with coumarin derivatives: Systematic review and meta-analysis. Br J Clin Pharmacol 2021; 87:4488-4503. [PMID: 33973668 DOI: 10.1111/bcp.14892] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 04/23/2021] [Accepted: 05/01/2021] [Indexed: 12/17/2022] Open
Abstract
AIMS We sought to investigate the association between sex and oral anticoagulation control employing coumarin derivatives. METHODS Electronic sources were MEDLINE, Biblioteca Virtual em Saúde (BVS), The Cumulative Index to Nursing and Allied Health Literature (CINAHL), EMBASE, Cochrane Central and Web of Science. Inclusion criteria were: observational and experimental studies; age ≥18 years; both sexes; treatment with any coumarin derivative for ≥3 months; any indication of long-term use; quality of oral anticoagulation measured by time in therapeutic range (TTR). The meta-analysis was developed with odds ratios (OR) for binary variables and mean differences (MD) for continuous variables, using random-effects models (DerSimonian and Laird) with 95% confidence intervals (CI). RESULTS Overall, 22 articles were selected, comprising 16 cohort studies, four cross-sectional studies and two clinical trials. The number of participants ranged from 110 to 104 505 (183 612; women: 45%). The main indication of oral anticoagulation was atrial fibrillation. Most studies reported the use of warfarin. In the meta-analysis, 15 studies were analysed using TTR as a binary variable (OR = 0.87; 95% CI = 0.78, 0.96; z = -2.75; P = .006.; I2 = 67%) and seven studies as a continuous variable (MD = -2.97; 95% CI = -4.80, -1.14; z = -3.19; P = .0014; I2 = 75%). The pooled estimates indicated that women were associated with lower TTR than men. CONCLUSIONS Our findings revealed an association between female sex and worse oral anticoagulation control. Further studies are needed with primary design to investigate sex-related factors influencing oral anticoagulation control with coumarin derivatives. Innovative strategies focused on women's health may be useful to improve patient-centred care.
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Affiliation(s)
- Catiane Costa Viana
- Faculdade de Farmácia, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, Pampulha, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Marcus Fernando da Silva Praxedes
- Faculdade de Farmácia, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, Pampulha, Belo Horizonte, Minas Gerais, 31270-901, Brazil.,Centro de Ciências da Saúde, Universidade Federal do Recôncavo da Bahia, Av. do Cajueiro 1015, Cajueiro, Santo Antonio de Jesus, Bahia, 44574-490, Brazil
| | - Waleska Jaclyn Freitas Nunes de Sousa
- Faculdade de Medicina da Universidade Federal de Minas Gerais, Av. Prof. Alfredo Balena, 190, Bairro Santa Efigênia, Belo Horizonte, Minas Gerais, 30130-100, Brazil.,Hospital das Clínicas da Universidade Federal de Minas Gerais, Av. Prof. Alfredo Balena, 110, Bairro Santa Efigênia, Belo Horizonte, Minas Gerais, 30130-100, Brazil
| | - Frederico Bartolazzi
- Faculdade de Medicina da Universidade Federal de Minas Gerais, Av. Prof. Alfredo Balena, 190, Bairro Santa Efigênia, Belo Horizonte, Minas Gerais, 30130-100, Brazil
| | - Mayara Sousa Vianna
- Faculdade de Farmácia, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, Pampulha, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - José Luiz Padilha da Silva
- Departamento de Estatística da Universidade Federal do Paraná, R. Evaristo F. Ferreira da Costa, 408, Jardim das Américas, Curitiba, Paraná, 81530-015, Brazil
| | - Maria Auxiliadora Parreiras Martins
- Faculdade de Farmácia, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, Pampulha, Belo Horizonte, Minas Gerais, 31270-901, Brazil.,Faculdade de Medicina da Universidade Federal de Minas Gerais, Av. Prof. Alfredo Balena, 190, Bairro Santa Efigênia, Belo Horizonte, Minas Gerais, 30130-100, Brazil.,Hospital das Clínicas da Universidade Federal de Minas Gerais, Av. Prof. Alfredo Balena, 110, Bairro Santa Efigênia, Belo Horizonte, Minas Gerais, 30130-100, Brazil
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8
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Avarello I, Bianchi S, Toschi V, Zighetti ML, Faioni EM. Time in therapeutic range is lower in women than in men and is not explained by differences in age or comorbidity. Thromb Res 2021; 203:18-21. [PMID: 33901765 DOI: 10.1016/j.thromres.2021.04.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 03/18/2021] [Accepted: 04/06/2021] [Indexed: 01/20/2023]
Abstract
BACKGROUND Time in therapeutic range (TTR) measures the stability of the international normalized ratio in patients on vitamin K antagonists (VKA). Low values are associated with poor outcomes. Women were shown to have lower TTR than men, but the causes are poorly defined. It was suggested that women on VKA are older and more morbid than men, and this could affect the stability of anticoagulation. We aimed to identify variables that affect TTR differently in women and men. MATERIALS AND METHODS This is a retrospective study in patients referred to a University hospital anticoagulant clinic. Age, sex, comorbidities, number of daily medications, indication and type of anticoagulant, weekly dosage and distribution, were derived from electronic records. Differences by sex and regression analysis to identify significant modulators of TTR were computed. RESULTS 1182 women and 1281 men on VKA were studied. Women were older than men (81.5 yrs. ± 11.2 vs 78.4 yrs. ± 12.2), and had lower TTR (65% ± 20.3 vs 69% ± 19.8). Comorbidity was similar between sexes and negatively affected TTR in both. Mechanical valves as an indication to anticoagulation and acenocoumarol as an anticoagulant as opposed to warfarin had a strong negative influence on TTR, while age increased TTR. Being a man rather than a woman afforded more than three TTR points. Number of medications and average anticoagulant dose were equal between sexes. DISCUSSION Women have a lower TTR than men, on average below the safety threshold. They were indeed older, but age positively influenced TTR. Since women and men were equally comorbid, neither age nor disease explains differences in TTR. None of the other variables included in the study could explain the gender gap in TTR. Since women are at increased risk of cardioembolic stroke in atrial fibrillation, an effort at defining other causes for the observed differences, closer monitoring and switching to direct anticoagulants whenever possible is warranted.
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Affiliation(s)
- Ilaria Avarello
- SIMT, ASST Santi Paolo e Carlo, University of Milan, Milan, Italy
| | - Susanna Bianchi
- Department of Health Sciences, University of Milan, Milan, Italy
| | - Vincenzo Toschi
- SIMT, ASST Santi Paolo e Carlo, University of Milan, Milan, Italy
| | | | - Elena M Faioni
- SIMT, ASST Santi Paolo e Carlo, University of Milan, Milan, Italy; Department of Health Sciences, University of Milan, Milan, Italy.
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9
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Oliveira GMMD, Brant LCC, Polanczyk CA, Biolo A, Nascimento BR, Malta DC, Souza MDFMD, Soares GP, Xavier Junior GF, Machline-Carrion MJ, Bittencourt MS, Pontes Neto OM, Silvestre OM, Teixeira RA, Sampaio RO, Gaziano TA, Roth GA, Ribeiro ALP. Cardiovascular Statistics - Brazil 2020. Arq Bras Cardiol 2020; 115:308-439. [PMID: 33027364 PMCID: PMC9363085 DOI: 10.36660/abc.20200812] [Citation(s) in RCA: 83] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 09/09/2020] [Indexed: 02/06/2023] Open
Affiliation(s)
- Gláucia Maria Moraes de Oliveira
- Instituto do Coração Edson Saad da Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro , RJ - Brasil.,Disciplina de Cardiologia, Departamento de Clínica Médica da Faculdade de Medicina da Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro , RJ - Brasil
| | - Luisa Campos Caldeira Brant
- Departamento de Clínica Médica da Faculdade de Medicina da Universidade Federal de Minas Gerais (UFMG), Belo Horizonte , MG - Brasil.,Serviço de Cardiologia e Cirurgia Cardiovascular e Centro de Telessaúde do Hospital das Clínicas da Universidade Federal de Minas Gerais (UFMG), Belo Horizonte , MG - Brasil
| | - Carisi Anne Polanczyk
- Faculdade de Medicina da Universidade Federal do Rio Grande do Sul (UFRS), Porto Alegre , RS - Brasil.,Serviço de Cardiologia do Hospital Moinhos de Vento , Porto Alegre , RS - Brasil.,Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre , RS - Brasil
| | - Andreia Biolo
- Faculdade de Medicina da Universidade Federal do Rio Grande do Sul (UFRS), Porto Alegre , RS - Brasil.,Serviço de Cardiologia do Hospital Moinhos de Vento , Porto Alegre , RS - Brasil.,Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre , RS - Brasil
| | - Bruno Ramos Nascimento
- Departamento de Clínica Médica da Faculdade de Medicina da Universidade Federal de Minas Gerais (UFMG), Belo Horizonte , MG - Brasil.,Serviço de Cardiologia e Cirurgia Cardiovascular e Centro de Telessaúde do Hospital das Clínicas da Universidade Federal de Minas Gerais (UFMG), Belo Horizonte , MG - Brasil
| | - Deborah Carvalho Malta
- Programa de Pós-Graduação em Saúde Pública da Universidade Federal de Minas Gerais (UFMG), Belo Horizonte , MG - Brasil
| | - Maria de Fatima Marinho de Souza
- Programa de Pós-Graduação em Saúde Pública da Universidade Federal de Minas Gerais (UFMG), Belo Horizonte , MG - Brasil.,Organização Vital Strategies , Nova York - EUA
| | - Gabriel Porto Soares
- Instituto do Coração Edson Saad da Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro , RJ - Brasil.,Curso de Medicina da Universidade de Vassouras , Vassouras , RJ - Brasil
| | | | | | - Marcio Sommer Bittencourt
- Divisão de Clínica Médica do Hospital Universitário da Universidade de São Paulo , São Paulo , SP - Brasil.,Faculdade Israelita de Ciências da Saúde Albert Einstein , São Paulo , SP - Brasil
| | - Octavio M Pontes Neto
- Serviço de Neurologia Vascular e Emergências Neurológicas, Divisão de Neurologia, Departamento de Neurociências e Ciências do Comportamento , Faculdade de Medicina de Ribeirão Preto da Universidade de São Paulo (USP), São Paulo , SP - Brasil
| | | | - Renato Azeredo Teixeira
- Programa de Pós-Graduação em Saúde Pública da Universidade Federal de Minas Gerais (UFMG), Belo Horizonte , MG - Brasil
| | - Roney Orismar Sampaio
- Departamento de Cardiopneumologia da Faculdade de Medicina da Universidade de São Paulo (USP), São Paulo , SP - Brasil.,Programa de Pós-Graduação da Faculdade de Medicina da Universidade de São Paulo (USP), São Paulo , SP - Brasil.,Unidade Clínica de Cardiopatias Valvares do Instituto do Coração (Incor) do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo (HCFMUSP), São Paulo , SP - Brasil
| | - Thomaz A Gaziano
- Brigham and Women's Hospital , Boston - EUA.,Department of Medicine , Cardiovascular, Harvard Medical School , Boston - EUA
| | - Gregory A Roth
- Global Health and Health Metrics Sciences at the Institute for Health Metrics and Evaluation (IHME), Washington - EUA.,Division of Cardiology at the University of Washington School of Medicine , Washington - EUA
| | - Antonio Luiz Pinho Ribeiro
- Departamento de Clínica Médica da Faculdade de Medicina da Universidade Federal de Minas Gerais (UFMG), Belo Horizonte , MG - Brasil.,Serviço de Cardiologia e Cirurgia Cardiovascular e Centro de Telessaúde do Hospital das Clínicas da Universidade Federal de Minas Gerais (UFMG), Belo Horizonte , MG - Brasil
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10
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Impact of adherence to warfarin therapy during 12 weeks of pharmaceutical care in patients with poor time in the therapeutic range. J Thromb Thrombolysis 2020; 51:1043-1049. [PMID: 32974757 DOI: 10.1007/s11239-020-02280-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 09/07/2020] [Indexed: 01/17/2023]
Abstract
Poor adherence to warfarin treatment is a contributor to poor quality of treatment, which increases the risk of bleeding and thromboembolic events. This study aims to evaluate the impact of adherence to warfarin therapy on anticoagulation quality during 12 weeks of pharmaceutical care and after 1 year of follow-up for patients with atrial fibrillation and with poor TTR. The Arrhythmia Unit of tertiary hospital in Brazil. We included 262 patients with AF and poor quality of anticoagulation therapy with warfarin (TTR < 50%). Pharmacist-driven therapy management was performed for 12 weeks and patients were also evaluated 1 year after the end of the follow-up with a pharmacist. Adherence was classified into high adherence, medium adherence and low adherence. Impact of adherence to warfarin therapy after pharmaceutical care. Of the 262 patients, 160 were high adherence, 71 were medium adherence and 31 were low adherence. No statistically significant difference is found between adherence groups in demographic and clinical variables. The TTR basal means were not different among adherence groups (p = 0.386). However, the means of TTR 12 weeks and TTR 1 year after the end of protocol were statistically different among adherence groups (p < 0.001 and p = 0.002, respectively). When we compared TTR values at different times within the adherence group, we observed that there is a statistical difference between the three TTR means (basal versus 12 weeks versus 1 year after) within the adherence group (p < 0.001). Patients with poor anticoagulation control, who adhered to the treatment with warfarin during the pharmaceutical care had better anticoagulation quality compared to those who did not adhere to the therapy with warfarin.
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11
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Marcatto LR, Sacilotto L, Tavares LC, Souza DSP, Olivetti N, Strunz CMC, Darrieux FCC, Scanavacca MI, Krieger JE, Pereira AC, Santos PCJL. Evaluation of the Long-Term Impact on Quality After the End of Pharmacist-Driven Warfarin Therapy Management in Patients With Poor Quality of Anticoagulation Therapy. Front Pharmacol 2020; 11:1056. [PMID: 32765269 PMCID: PMC7381215 DOI: 10.3389/fphar.2020.01056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Accepted: 06/29/2020] [Indexed: 12/14/2022] Open
Abstract
Background Warfarin is the most common oral anticoagulant drug, especially in low-income and emerging countries, because of the high cost of direct oral anticoagulant (DOACs), or when warfarin is the only proven therapy (mechanical prosthetic valve and kidney dysfunction). The quality of warfarin therapy is directly associated with dose management. Evidence shows that pharmaceutical care achieves a better quality of therapy with warfarin. However, there are no studies showing this intervention in a specific patient group with poor quality of anticoagulation in a long period after the end of the follow-up by a pharmacist. Thus, the aim of this study was to evaluate whether the quality of warfarin therapy driven by a pharmacist remains stable in the long term after the end of follow up with a pharmacist, in AF patients with poor quality of anticoagulation. Methods This is a prospective study, which evaluated about 2,620 patients and selected 262 patients with AF and poor quality of anticoagulation therapy with warfarin (TTR<50% - based on the last three values of international normalized ratio). Pharmacist-driven therapy management was performed up to 12 weeks. Data from patients were evaluated 1 year after the end of the follow-up with pharmacist. Results Comparison between mean TTR after 12 weeks of pharmaceutical care (54.1%) and mean TTR one year after the end of the pharmaceutical care (56.5%; p=0.081) did not achieve statistical difference, demonstrating that the increment of quality due to intervention of 12 weeks was maintained for 1 year after intervention. Conclusion The long-term impact of pharmaceutical care was beneficial for patients with AF and poor quality of warfarin anticoagulation. This design might be an important strategy to treat a subgroup of patients without proven effectiveness of warfarin.
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Affiliation(s)
- Leiliane Rodrigues Marcatto
- Laboratory of Genetics and Molecular Cardiology, Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Luciana Sacilotto
- Arrhythmia Unit, Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Letícia Camargo Tavares
- Laboratory of Genetics and Molecular Cardiology, Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Debora Stephanie Pereira Souza
- Department of Pharmacology, Escola Paulista de Medicina, Universidade Federal de São Paulo, EPM-Unifesp, São Paulo, Brazil
| | - Natália Olivetti
- Arrhythmia Unit, Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Celia Maria Cassaro Strunz
- Clinical Laboratory, Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina da Umiversidade de Sao Paulo, Sao Paulo, Brazil
| | - Francisco Carlos Costa Darrieux
- Arrhythmia Unit, Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Maurício Ibrahim Scanavacca
- Arrhythmia Unit, Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Jose Eduardo Krieger
- Laboratory of Genetics and Molecular Cardiology, Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Alexandre Costa Pereira
- Laboratory of Genetics and Molecular Cardiology, Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Paulo Caleb Junior Lima Santos
- Department of Pharmacology, Escola Paulista de Medicina, Universidade Federal de São Paulo, EPM-Unifesp, São Paulo, Brazil
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12
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da Silveira MMBM, Melo LDA, Gomes FMF, Andrade LJDCBDR, Serur IP, Piscoya ICDV, Gueiros RM, Palmeira do Ó K, de Lima RE, Brasileiro VAE, Vasconcelos LRS, Sobral Filho DC. Polymorphisms of CYP2C9*2, CYP2C9*3 and VKORC1 genes related to time in therapeutic range in patients with atrial fibrillation using warfarin. Appl Clin Genet 2019; 12:151-159. [PMID: 31447576 PMCID: PMC6684853 DOI: 10.2147/tacg.s197316] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 04/10/2019] [Indexed: 02/01/2023] Open
Abstract
INTRODUCTION Warfarin continues to be the most widely used anticoagulant in clinical practice around the world for the prevention of thromboembolic events in patients with atrial fibrillation (AF). The evaluation of the quality of anticoagulation control, estimated by time in therapeutic range (TTR), is accepted as a good method to evaluate the quality of anticoagulation. The variability of TTR can be explained by the presence of variants of the CYP2C9 and VKORC1 genes. METHODS This study examined the association between polymorphisms of the CYP2C9 and VKORC1 genes and control of oral anticoagulation, through TTR, in patients with AF. A cross-sectional study was conducted within a cohort follow-up. The study comprised of 317 patients with AF, using warfarin, who were followed up for one year. The genotyping of genes CYP2C9 (rs1057910), (rs1799853) and VKORC1 (rs923231) was performed by PCR in real time, using TaqMan probes. RESULTS Patients who had variant genotypes for the CYP2C9*3 gene (rs1057910) presented higher TTR (TTR 81-100%) when compared to when compared to the <45% and 46-60% TTR groups (p=0.005 and p=0.002, respectively). Regarding VKORC1 (rs923231), patients who had the variant genotype for the VKORC1 (rs923231) gene also presented a higher TTR (TTR 81-100%), when when compared to the <45% and 46-60% TTR groups (p=0.005 and p=0.004, respectively). In a multivariate model, VKORC1 (rs923231) remained associated for comparisons with the TTR groups (<45% vs 81-100% groups, p=0.01; and 46-60% vs 81-100% groups, p=0.01). CONCLUSION The genotypes of the CYP2C9*3 (AA) and VKORC1 -1639 (GG) genes were associated with the worst quality of anticoagulation control (TTR) in patients with AF using warfarin in the northeast of Brazil.
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Affiliation(s)
- Maria Mariana Barros Melo da Silveira
- Faculdade de Ciências Médicas, Universidade de Pernambuco - FCM/UPE, Recife, Brazil
- Pronto Socorro Cardiológico Professor Luiz Tavares - PROCAPE/UPE
, Recife, Brazil
| | - Leiliandry de Araújo Melo
- Faculdade de Ciências Médicas, Universidade de Pernambuco - FCM/UPE, Recife, Brazil
- Pronto Socorro Cardiológico Professor Luiz Tavares - PROCAPE/UPE
, Recife, Brazil
| | | | | | | | | | | | | | | | - Victor Arthur Eulálio Brasileiro
- Faculdade de Ciências Médicas, Universidade de Pernambuco - FCM/UPE, Recife, Brazil
- Pronto Socorro Cardiológico Professor Luiz Tavares - PROCAPE/UPE
, Recife, Brazil
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13
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Marcatto LR, Sacilotto L, Tavares LC, Facin M, Olivetti N, Strunz CMC, Darrieux FCC, Scanavacca MI, Krieger JE, Pereira AC, Santos PCJL. Pharmaceutical Care Increases Time in Therapeutic Range of Patients With Poor Quality of Anticoagulation With Warfarin. Front Pharmacol 2018; 9:1052. [PMID: 30298004 PMCID: PMC6160801 DOI: 10.3389/fphar.2018.01052] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Accepted: 08/31/2018] [Indexed: 12/26/2022] Open
Abstract
Thromboembolic events are associated with high mortality and morbidity indexes. In this context, warfarin is the most widely prescribed oral anticoagulant agent for preventing and treating these events. This medication has a narrow therapeutic range and, consequently, patients usually have difficulty in achieving and maintaining stable target therapeutics. Some studies on the literature about oral anticoagulant management showed that pharmacists could improve the efficiency of anticoagulant therapy. However, the majority of these studies included general patients retrospectively. The aim of this study was to prospectively evaluate a pharmacist’s warfarin management in patients with poor quality of anticoagulation therapy (Time in the Therapeutic Range- TTR < 50%). We included 268 patients with atrial fibrillation (AF) and without stable dose of warfarin (TTR < 50%, based on the last three values of International Normalized Ratio-INR). We followed them up for 12 weeks, INR values were evaluated and, when necessary, the dose adjustments were performed. During the first four visits, patient’s INR was measured every 7 days. Then, if INR was within the target therapeutic range (INR: 2–3), the patient was asked to return in 30 days. However, if INR was out the therapeutic target, the patient was asked to return in 7 days. Adherence evaluation was measured through questionnaires and by counting the pills taken. Comparison between basal TTR (which was calculated based on the three last INR values before prospective phase) and TTR of 4 weeks (calculated by considering the INR tests from visits 0 to 4, in the prospective phase of the study) and basal TTR and TTR of 12 weeks (calculated based on the INR tests from visits 0 to 12, in the prospective phase of the study) revealed significant statistical differences (0.144 ± 0.010 vs. 0.382 ± 0.016; and 0.144 ± 0.010 vs. 0.543 ± 0.014, p < 0.001, respectively). We also observed that the mean TTR of 1 year before (retrospective phase) was lower than TTR value after 12 weeks of pharmacist-driven treatment (prospective phase) (0.320 ± 0.015; 0.540 ± 0.015, p < 0.001). In conclusion, pharmaceutical care was able to improve TTR values in patients with AF and poor quality of anticoagulation with warfarin.
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Affiliation(s)
- Leiliane Rodrigues Marcatto
- Laboratory of Genetics and Molecular Cardiology, Faculdade de Medicina FMUSP, Heart Institute (InCor), Universidade de São Paulo, São Paulo, Brazil
| | - Luciana Sacilotto
- Arrythmia Unit, Faculdade de Medicina FMUSP, Heart Institute (InCor), Universidade de São Paulo, São Paulo, Brazil
| | - Letícia Camargo Tavares
- Laboratory of Genetics and Molecular Cardiology, Faculdade de Medicina FMUSP, Heart Institute (InCor), Universidade de São Paulo, São Paulo, Brazil
| | - Mirella Facin
- Arrythmia Unit, Faculdade de Medicina FMUSP, Heart Institute (InCor), Universidade de São Paulo, São Paulo, Brazil
| | - Natália Olivetti
- Arrythmia Unit, Faculdade de Medicina FMUSP, Heart Institute (InCor), Universidade de São Paulo, São Paulo, Brazil
| | - Celia Maria Cassaro Strunz
- Clinical Laboratory, Heart Institute (InCor), Faculdade de Medicina FMUSP, Heart Institute (InCor), Universidade de São Paulo, São Paulo, Brazil
| | | | - Maurício Ibrahim Scanavacca
- Arrythmia Unit, Faculdade de Medicina FMUSP, Heart Institute (InCor), Universidade de São Paulo, São Paulo, Brazil
| | - Jose Eduardo Krieger
- Laboratory of Genetics and Molecular Cardiology, Faculdade de Medicina FMUSP, Heart Institute (InCor), Universidade de São Paulo, São Paulo, Brazil
| | - Alexandre Costa Pereira
- Laboratory of Genetics and Molecular Cardiology, Faculdade de Medicina FMUSP, Heart Institute (InCor), Universidade de São Paulo, São Paulo, Brazil
| | - Paulo Caleb Junior Lima Santos
- Laboratory of Genetics and Molecular Cardiology, Faculdade de Medicina FMUSP, Heart Institute (InCor), Universidade de São Paulo, São Paulo, Brazil.,Department of Pharmacology, Universidade Federal de São Paulo - Escola Paulista de Medicina, São Paulo, Brazil
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14
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Tavares LC, Duarte NE, Marcatto LR, Soares RAG, Krieger JE, Pereira AC, Santos PCJL. Impact of incorporating ABCB1 and CYP4F2 polymorphisms in a pharmacogenetics-guided warfarin dosing algorithm for the Brazilian population. Eur J Clin Pharmacol 2018; 74:1555-1566. [PMID: 30051215 DOI: 10.1007/s00228-018-2528-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Accepted: 07/16/2018] [Indexed: 12/15/2022]
Abstract
PURPOSE Interpatient variation of warfarin dose requirements may be explained by genetic variations and general and clinical factors. In this scenario, diverse population-calibrated dosing algorithms, which incorporate the main warfarin dosing influencers, have been widely proposed for predicting supposed warfarin maintenance dose, in order to prevent and reduce adverse events. The aim of the present study was to evaluate the impact of the inclusion of ABCB1 c.3435C>T and CYP4F2 c.1297G>A polymorphisms as additional covariates in a previously developed pharmacogenetic-based warfarin dosing algorithm calibrated for the Brazilian population. METHODS Two independent cohorts of patients treated with warfarin (n = 832 and n = 133) were included for derivation and replication of the algorithm, respectively. Genotyping of ABCB1 c.3435C>T and CYP4F2 c.1297G>A polymorphisms was performed by polymerase chain reaction followed by melting curve analysis and TaqMan® assay, respectively. A multiple linear regression was performed for the warfarin stable doses as a dependent variable, considering clinical, general, and genetic data as covariates. RESULTS The inclusion of ABCB1 and CYP4F2 polymorphisms was able to improve the algorithm's coefficient of determination (R2) by 2.6%. In addition, the partial determination coefficients of these variants revealed that they explained 3.6% of the warfarin dose variability. We also observed a marginal improvement of the linear correlation between observed and predicted doses (from 59.7 to 61.4%). CONCLUSION Although our study indicates that the contribution of the combined ABCB1 and CYP4F2 genotypes in explaining the overall variability in warfarin dose is not very large, we demonstrated that these pharmacogenomic data are statistically significant. However, the clinical relevance and cost-effective impact of incorporating additional variants in warfarin dosing algorithms should be carefully evaluated.
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Affiliation(s)
- Letícia C Tavares
- Laboratory of Genetics and Molecular Cardiology, Heart Institute (InCor), Faculdade de Medicina FMUSP, Universidade de Sao Paulo, São Paulo, SP, Brazil
| | - Nubia E Duarte
- Department of Mathematic and Statistics, Universidad Nacional de Colombia, Manizales, Caldas, Colombia
| | - Leiliane R Marcatto
- Laboratory of Genetics and Molecular Cardiology, Heart Institute (InCor), Faculdade de Medicina FMUSP, Universidade de Sao Paulo, São Paulo, SP, Brazil
| | - Renata A G Soares
- Laboratory of Genetics and Molecular Cardiology, Heart Institute (InCor), Faculdade de Medicina FMUSP, Universidade de Sao Paulo, São Paulo, SP, Brazil
| | - Jose E Krieger
- Laboratory of Genetics and Molecular Cardiology, Heart Institute (InCor), Faculdade de Medicina FMUSP, Universidade de Sao Paulo, São Paulo, SP, Brazil
| | - Alexandre C Pereira
- Laboratory of Genetics and Molecular Cardiology, Heart Institute (InCor), Faculdade de Medicina FMUSP, Universidade de Sao Paulo, São Paulo, SP, Brazil
| | - Paulo Caleb Junior Lima Santos
- Laboratory of Genetics and Molecular Cardiology, Heart Institute (InCor), Faculdade de Medicina FMUSP, Universidade de Sao Paulo, São Paulo, SP, Brazil.
- Department of Pharmacology, Escola Paulista de Medicina, Universidade Federal de Sao Paulo UNIFESP, São Paulo, SP, Brazil.
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